126618649 has 2 divisors, whose sum is σ = 126618650. Its totient is φ = 126618648.

The previous prime is 126618637. The next prime is 126618671. The reversal of 126618649 is 946816621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113039424 + 13579225 = 10632^2 + 3685^2 .

It is a cyclic number.

It is not a de Polignac number, because 126618649 - 2⁷ = 126618521 is a prime.

It is not a weakly prime, because it can be changed into another prime (126618689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63309324 + 63309325.

It is an arithmetic number, because the mean of its divisors is an integer number (63309325).

Almost surely, 2^126618649 is an apocalyptic number.

It is an amenable number.

126618649 is a deficient number, since it is larger than the sum of its proper divisors (1).

126618649 is an equidigital number, since it uses as much as digits as its factorization.

126618649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 43.

The square root of 126618649 is about 11252.4952343913. The cubic root of 126618649 is about 502.1489494673.

The spelling of 126618649 in words is "one hundred twenty-six million, six hundred eighteen thousand, six hundred forty-nine".